package com.nintendo.netty;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.util.concurrent.GlobalEventExecutor;

import java.time.LocalDateTime;

/**
 *  处理消息的handler
 *  TextWebSocketFrame  :在netty中 是用于为websocket 专门处理文本的对象 frame是消息的载体
 */
public class ChatHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {
    //用于记录和管理所有客户端的channel
    private static ChannelGroup clients = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);

    /**
     * 当客户端连接服务端之后 (打开连接)
     * 获取客户端的channle 并且放到ChannelGroup中去进行管理
     * @param ctx
     * @throws Exception
     */
    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        clients.add(ctx.channel());
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        // 当触发handlerRemoved ChannelGroup会自动移除对应的客户端channel
       clients.remove(ctx.channel());
        System.out.println("长id: "+ctx.channel().id().asLongText());
        System.out.println("短id: "+ctx.channel().id().asShortText());
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg)
            throws Exception {
        // 获取客户端传输过来的消息
        String content = msg.text();
        System.out.println("接收到的数据: "+content);

        for (Channel channel : clients){
            channel.writeAndFlush(new TextWebSocketFrame("[服务器在:]"+ LocalDateTime.now()+"接收到消息"+","+"消息为:"+content));
        }
        // 下面这个方法 和 上边的for循环一致
//        clients.writeAndFlush(new TextWebSocketFrame("[服务器在:]"+ LocalDateTime.now()+"接收到消息"+","+"消息为:"+content));










    }
}
